Abstract
Diffusion controlled evaporation rates of super micrometer binary oil droplets are measured by suspending charged oil droplets in a stabilizing electric field. Successive droplet masses are determined from the time-dependent gravity balancing direct current voltage and droplet diameters are measured using a 35-mm objective in conjunction with an image splitter. The evaporation of solution oil droplets, composed of varying concentrations of dioctyl phthalate and dibutyl phthalate, is monitored at temperatures of 23 and 41°C. The evaporation kinetics of the binary oil droplets is modeled according to classical diffusion theory and under the assumption that the oil solution is thermodynamically ideal. Comparison of theory and experiment shows excellent agreement, demonstrating the dioctyl-dibutyl phthalate solution is thermodynamically ideal.
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